tonkin



(No Model.) 2 Sheets-Sheet 1.

J. J. TONKIN.

(moss HEAD FOR STEAM ENGINES.

No. 397.318. Patented Feb. 5, 1889.

c Ely C I Z I Z- Y WlTNi-ISSES: INVENTDR N. PETERS. nwwum n w, Wumngtan. n. a

(No Model.) 2.Sheets-Shet 2. J. J. TONKIN.

GROSS HEAD FOR STEAM ENGINES. N0. 397,318. Patented'Feb. 5, 1889.

N. PETERS. Phnfo-Ulhographvr. With-him". D. C.

NTTED STATES PATENT OFFICE.

J OHN JAY TONKIN, OF OS\VEGO, NE\V YORK, ASSIGNOR TO THOMSON KINGS- FORD, OF SAME PLACE.

CROSS HEAD FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 397,318, dated February 5, 1889.

Application tiled October 10, 1888. Serial No. 287,751. (No model.)

To a 111710111 it may coltz'wrlt: the said split portions together, and thus Be it known that I, JOHN J AY TONKIN, of tighten the wrist-pin in the ears. Said attach- Oswego, in the county of Oswcgo, in the State ment also permits of turning the wrist-pin in of New York, have invented new and useful its seat, so as to present the top and bottom Improvements in Cross-Heads for Steam-Enportions of the wrist-pin toward the front and gines, of which the following, taken in conrear in case the wrist-pin has become Worn. nection with the accompanying drawings, is a The end of the cross-head toward the cylinfull, clear, and exactdescription. der of the engine is formed with a transverse This invention consists in a novel consirucbridge, (I, which has an eye, d, for the recep- 10 tion of a cross-head having a transverselytion of the end of the piston-rod I, which is convexed bottom bearing riding in a corresecured to the headblock,preferably by screwspondingly-concaved guide, and having at opthreads on the end portion of the piston-rod posite sides longitudinal top bearings sliding engaging corresponding screw-threads in the on gibs secured to the guide, said constrnceye d, as illustrated'in Fig. 2 of the draw I 5 tion and combination of parts rendering the ings. The bridge (I, I also split vertically cross-head light and yet strong, and allowing longitudinally from the eye (1 through the the same to be maintained properlylubricated top of the bridge and perforate the split porand easily in proper alignment. tions thereof for the reception of a bolt, 6,

The invention also consists in improved atprovided on one or both ends with a nut or 20 tachments of the wrist-pin and piston-rod to nutsby which to draw the split portions of the the cross-head, all as hereinafter more fully bridge together, and thcrebyinsure the attachexplained, and specifically set forth in th ment of the piston-rod. The bottom-plate,A,

claims. ears D D, with their sleeves b b, and the I11 the annexed drawings, Figure 1 is a top bridge d are all cast in one piece. 25 plan view of a crosshead embodying my in- The described cross-head is mounted on a vention. Fig. 2 is a longitudinal section on guide, C, which is formed concave to correline :1: 00, Fig. 1. Fig. 3 is a transverse section spond to the convex bottom bearing of the on line y 3 Fig. 2. Fig. at is a face view of cross-head, as illustrated by dotted lines in the end of the cross-head nearest the cylin- Fig. 3 of the drawings, and to the top of the 0 der of the engine; and Fig. 5 is a transverse side walls of this guide I attach gibsff, which section on line .6 .2, Fig. project over the top bearings, a a, of the cross- Similar letters of reference indicate correhead and serve as top guides for the same. sponding parts. Said gibs prevent the cross-head from turn- My improved cross-head is composed of the ing on its bottom bearing and also exclude 35 bottom plate, A, which is formed concavo-condust from the bearings.

vex in cross-section, with the convex side It will also be observed that the bottom downward to present a convex bearing for the bearing ofthe cross-head is easily maintained cross-head. The two sides of the crosshead lubricated, and its shape and extensive wearare formed with horizontal longitudinal top ing-surface render it very durable.

40 bearings, a. (1, preferably formed by inward Havingdescribed my invention,whatI claim offsets, as shown in Fig. 23 of the drawings. as new, and desire to secure by Letters Patent,

From the bottom plate, A, rise two ears, D is D, which are provided with cylindrical seats 1. A cross-head provided withatransverselyfor the ends of the wrist-pin P, which are convexed bottom bearing and with longitudi 45 formed correspondingly. Said ears are split nal top hearings on opposite sides of the cross- 5 vertically from the wrist-pin seats through head, in combination witha correspondinglythe top ot' the ears, as shown at z, and the tops coneaved guide, and gibs secured to the said of said split portions areformed with longiguide and projecting over the top bearings of tudinal sleeves b I), through which passes a the cross-head, as set forth,

5o bolt, 0, provided with a nut by which to draw 2. A cross-head composed of a bottom plate I00 formed convex in cross-section on its under side and with. horizontal longitudinal top bearings on opposite sides of the cross-howl, and ears projeetiug from said bottom plate, all formed in one pieee in (()llll)lll;lil()ll with a eel-respondingly-eonem'ed guide, gibs secured to the guide and projeeting over the horizontal top bearings oi the cross-head, and the. wrist- 0 a, passingthrtmgh the sleeves and provided .7

with nuts for ndjustnbly elzunping the split parts elf the ears together, substantially as described and shown.

1%. In OOlllbil'liLlllOll With the piston-rod I, the cross-head provided with the bridged, having the eye (1' for the reception of the end of the piston-rod and split longitudinally vertically from said eye through the top of the bridge, and the belt a, elmnping the split portions of the bridge together, substantially as d eseribed and shown.

In testi iuony whereol' I hnve hereunto signed my name, in the preseueeof two Witnesses, at Os\\'eg'o,in the eountvel Oswego, in the Stale of New York, this 28th day of September, 1888.

JOHN JAY TONKIN. [L. \Vitnesses:

'll-IOMAS P. Kmesmmn, HENRY L. Howls. 

